National political reporter

The independent Parliamentary Budget Office has found the Greens' key revenue-raising proposals would raise $43 billion for federal budget coffers over the next four years.

As Greens leader Christine Milne launches the party's national policy platform on Sunday, the budget office has costed the party's figures for its major revenue-raising initiatives.

The office found $42.7 billion would be raised by the Greens' proposed levy on the big banks, its mining tax restructure, ending tax breaks to "big miners", abolishing funding for so-called clean coal technology and increasing the marginal tax rate on incomes above $1 million.

The Greens say they would use the money to inject more cash into the school funding reforms and boost funding for Newstart, overseas aid, regional arts and the homeless.

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These revenue initiatives are not new for the Greens and have so far failed to gain support from the major parties but they have recently been re-examined by the budget office in the wake of the May budget, which projected a deficit of $18 billion in 2013-14.

"Raising money is about choice," Senator Milne said. "It's about choosing what's fair and what's appropriate and who can afford to pay.

"We're challenging the old parties to say why are they so afraid to take on the mining corporations, the fossil fuel industry, the big banks and the wealthiest in our society?"

The Greens' 52-page policy document, Standing up for What Matters: Healthy Environment, Caring Society and Clean Economy, will form the basis of the party's election fight.

Four new policies will be announced on Sunday, including a plan to roll out more money, more quickly under the Gonski education reforms.

The Greens want an extra $2 billion in federal money over the first four years of the school funding reforms, on top of the $3 billion already earmarked by the government for the period.

"Australian students and public schools need more, faster," the document says.

As well as the education reforms, the Greens want the extra money they have identified spent on reversing the recent $2.3 billion cut to universities, increasing Newstart and the youth allowance by $50 a week, increasing overseas aid to reach 0.7 per cent of gross national income by 2020, providing $3 billion to house the homeless and giving an extra $10 million for regional arts.

The three other new policies to be announced on Sunday will relate to the environment, research and development, and welfare.

Senator Milne said she had not talked to Prime Minister Kevin Rudd about the Greens' plans, saying she had met with him only once since he was voted in as Labor leader late last month.

The Greens face a tough battle to hold on to the balance of power in the Senate, with particular concerns about seats held by Sarah Hanson-Young in South Australia and Scott Ludlam in Western Australia.

Senator Milne said that with Mr Rudd back in power, it was "less likely that Tony Abbott would have such a resounding victory in the lower house as he seemed to be on track for.

However, it is critical that neither of the major parties get control of both houses of Parliament."